PiS® Test Socket PiS (Pin in Silicone) can reduce test cost. PiS® makes tension with silicone. µ-spring embedded in Silicone body. Simple structure, just pin in silicone, can make fine pitch solution. 0.2mm pitch or over Over 20GHz for high frequency test. Less Noise & Crosstalk with PiS design. PiS® can replace traditional rubber sockets with NO hassles of COK modification.